HP 40GS CAS cannot integrate X*SIN(X)

[gavenkoa]

(10-17-2024 09:05 PM)Andreas Debus Wrote:  In the first case you activated the APPROX flag in the CAS settings of your physical calculator. In the second case you activated the COMPLEX flag in the CAS settings.
That way I was able to reprocduce your "errors" which are exactly what is supposed to happen. The formula you see in the second case is just x*sin(x) in a more complicated form, because e^(ix) is cos(x)+isin(x) .

Thx! I found the settings for CAS by pressing SHIFT+SYMB and unchecking complex & approximation results in an expected symbolic solution!

IDK if ON+F3 is a full reset - it did nothing for me, the calc has come with CR2032 battery inside, it might remember settings from a previous owner.